incommutable

1.an incommutable death sentence.

能更改的死刑判决

2.a rare, incommutable skill.

宝贵的、千金换的技艺

3.The time-varying and incommutable character of the coefficient matrix of periodically time-varying linear systems are the bottleneck of the design for high precision direct integration methods.

周时变线性系统系数矩阵的时变性与可交换性是其精细积分算法设计中的瓶颈。